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Laboratory measurements of the recombination of PAH ions with electrons: implications for the PAH charge state in interstellar clouds

Alsayed Ali, Mohamed Ali (2006) Laboratory measurements of the recombination of PAH ions with electrons: implications for the PAH charge state in interstellar clouds. The Royal Society of Chemistry 2005 .

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Abstract

Laboratory measurements of the recombination of polycyclic aromatic hydrocarbon (PAH) ions with electrons are presented. Experimental data have been obtained at room temperature for azulene (C10H8) and acenaphthene (C12H10) cations by the Flowing Afterglow with PhotoIons method. The results confirm that the recombination of PAH ions is fast although well below the geometrical limit. The set of our recent and present measurements reveal a definite trend of increasing rate with the number of carbon atoms of the PAH. This behaviour that needs further characterization is potentially of great interest for charge state models as recombination is a dominant mechanism of PAH ion destruction in the interstellar medium. The design of experiments to measure the recombination of larger PAHs and their temperature dependence is discussed.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanochemistry
ID Code:10450
Deposited By:Dr Mohamed Ali Alsayed Ali
Deposited On:05 Jan 2011 18:14
Last Modified:05 Jan 2011 18:14

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